Speed work for a middle distance runner is very similar
the more endurance parts of a sprinters training. We can basically split
this section into two parts.
Firstly, although they don't tend to work on their technique as much as
a sprinter would, it is still vital to run with as good an action as possible.
Some would even argue it is more important, as a poor running technique will
use more energy than a good one and lead to premature fatigue in a race.
It is generally preferable to improve technique by practice of drills and
strides prior to a session, as during runs your concentration will naturally
be on the run itself.